Merge pull request #489 from jhuttana/stage-2-hooks

[OPENJDK-2899]Add hooks for stage-2 build

Author: jmtd

templates/jlink/jlinked-app.yaml

@@ -21,6 +21,12 @@ parameters:
 - description: Context Dir to use for the jlink workflow
   name: CONTEXT_DIR
   required: true
+- description: A secret string used to configure the GitHub webhook
+  name: GITHUB_WEBHOOK_SECRET
+  generate: expression
+  from: "[a-zA-Z0-9]{16}"
+  required: true
+message: "... The GitHub webhook secret is ${GITHUB_WEBHOOK_SECRET} ..."
 ##############################################################################
 # Following are the objects(imagestream and buildconfigs) for all the 3-stages
 objects:
@@ -112,6 +118,17 @@ objects:
       to:
         kind: ImageStreamTag
         name: intermediate:latest
+    triggers:
+      - type: ConfigChange
+      - type: ImageChange
+        imageChange:
+          from:
+            kind: ImageStreamTag
+            name: ubi9-openjdk-${JDK_VERSION}-jlink:latest  # Output of stage-1 which serves as input to stage-2
+      - type: GitHub
+        github:
+          secret: ${GITHUB_WEBHOOK_SECRET}
+          event: push
 ##############################################################################
 # stage-3: The ubi-micro ImageStream
 - apiVersion: image.openshift.io/v1